Calculate total number of commits from merges

get_number_of_merged_commits.sh

n=0
PATTERN=ti-linux-4.14.y
while read line; do
  hash=`echo "$line" | cut -f1 -d' '`
  nn=`git show "$hash" | head -2 | tail -1 | awk '{ print $2".."$3 }' | xargs git log --pretty=oneline | wc -l`
  echo "$nn": "$line"
  n=$(($n + $nn))
done <<< "$(git log --grep 'Merge branch' --abbrev-commit --pretty=oneline | grep $PATTERN)"
echo "Total number of commits:" $n